I use black RTV sparingly on both sides of the gasket, smearing it evenly with a finger. I am not worried about excess getting into the water jacket, since there won't be any due to the word "sparingly" and if any got into the water jacket, nothing bad would happen.
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission